Incorrect, marriage is enshrined in law as it enables specific rights, in particular with this debate are reproductive rights. So please spell out how the following rights would work if homosexual and heterosexual marriage are completely equal in all ways when in fact biology dictates they are not.
Lesbian marriages could visit a sperm bank what would the equivalent right be for a gay marriage?
Should hetro couples be given priority in adoption all else being equal?
Should gay sex be taught in schools in sex ed classes?
Should children have the right not to be purposefully removed from one of their birth parents for no other reason than their parents sexual orientation?
Is it beneficial for children to have both male and female role models living with them?